Owner`s manual

3.4.2.9 Dual Half-Bridge Inverters
In or to provide more choices of output voltage, two identical half-bridge inverters are used to produce either
120VAC or 240VAC depending on parallel or series connection of the outputs. A network that consists of a coupled
inductors and high frequency capacitors form a second-order low pass filter and is connected across at each
inverter’s output for removing PWM signal. See figure 4-4.
3.4.2.10 Average Current Mode Control
A microprocessor is employed in the inverter system to generate a reference sine wave via one of its three PWM
outputs. The PWM signal is filtered to make a clean sine wave. This sine wave is applied to a voltage error
amplifier.
Owner’s Manual
Maintenance page 3 — 5